09-19 YAMAHA YFZ450R: QuadBoss Steering Stem Bearing Kit (Lower) Chances are you're all too familiar with this question: What are you going to do with it? Whether it's your spouse, buddy, the powersport dealer, or even yourself that asked it, the number of answers are nearly limitless. Your quad doesn't have to look like or perform like every other quad that came rolling off the assembly line. You can MAKE IT YOURS. Customize it to your specific needs. Whatever your answer, QuadBoss is here to help.